hiya mate birds must av bn in good condition b4 u paird them where about r u good luck wi the silvers im lookn for one or pair ive just started rollers up but bn round my dads racers all my life so hve sme knowlege ive only got 2 pair just now but there down on eggs just now the guy i got them of had silver grizzle that was a nice bird only time ive cn 1 anyway good luck wi the birds mate